Tunable and chirp free femtosecond signal pulses generated by a PPLN OPO pumped by Ytterbium fiber laser chirped pulses

Gabriel Amiard-Hudebine (1) , Eric Freysz (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine

Chirp of the pulses generated in the 1.4 µm-1.8 µm spectral ranges and in a singly resonant OPO build around a 3 mm long PPLN crystal pumped at 108 MHz by 40 nJ, 1 ps chirped or 350 fs weakly chirped pump pulses centered at 1035 nm is analyzed. Whatever the chirp of the pump pulses, we achieved a pump to signal conversion efficiency > 30%. We demonstrate that by adjusting the cavity length around synchronism condition, chirped or almost chirped free (down to 80 fs) signal pulses are generated. A simple mechanism accounts for this phenomenon.

Mots clés: Optical parametric oscillators; Parametric generation; Parametric amplification; Three-waves mixing; Femtoseconde pulse; Chirped pulse; Ytterbium fiber laser; PPLN crystal

Domaines: Physique [physics]; Optique [physics.optics]

Gabriel Amiard-Hudebine, Eric Freysz. Tunable and chirp free femtosecond signal pulses generated by a PPLN OPO pumped by Ytterbium fiber laser chirped pulses. Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, Feb 2019, San Francisco, United States. pp.21, ⟨10.1117/12.2505870⟩. ⟨hal-02358901⟩